Help w/Games Loading

Hi Guys - I feel like I must be missing something simple here. I'm just using Demul for the 1st time and grabbed the latest version. I have the correct bios files and a .chd romset known to be good. I've selected the correct GDROM driver for CHDs, set the correct directories (even put things in the same directory under "roms" to be sure) and loading the roms before system boot. The rom name does appear in the header and the DC console launches. It just won't load any game. Each time I boot to DC, it gives me the console and when I try "play" it goes right back to it.

This seems like a simple thing, but if more info is needed, please let me know. I'm running Win10 64-bit on a fairly high-end machine all with updated FW, drivers, etc.